He only uses a finger for the most powerful devil

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A Greater Than Solomon Is Here

Oh, I want you to look at a beautiful thing here. When Jesus goes to cast out a devil, it's so little to Him till He just takes His finger to cast it away. That's all He has to use. Oh, blessed be His holy Name. He only uses a finger for the most powerful devil that could rise out of the burning hell. One little finger He casts it away. That's all He does. But when He's got a lost sheep gone astray, and when He goes to bring it back, He takes it and lays it over His shoulder. The strongest part of a man is in his back and shoulders. And He takes His most strongest part, not His finger, but a lost sheep, throws it over His shoulders and gently bears it back to the fold. When a devil's only used by a finger…

Daily Bread Matthew 18:12
How think ye? if a man have an hundred sheep, and one of them be gone astray, doth he not leave the ninety and nine, and goeth into the mountains, and seeketh that which is gone astray?